Thinker is the best Milanote Alternative with essentials like best free virtual whiteboards, a free Kanban board, and scratchpads to make it the best Productive app and one of the best Brainstorming apps out there.
Company Website: https://www.thinkerapp.org
$12.50
After Purchasing, you will get an activation key and a file to download. After downloading it, extract the file, copy it to The applications folder and start using the app.
$12.50
After downloading the file, extract the zip and run the Thinker.exe file. Enter the activation key when you open the app.